For me, I used to lift back when I was 20 because I'd gained a fair bit of weight. I was content in my relationship, and we both kind of let things go. I wanted to look and feel better about myself. I really got into it, within 1 year losing about 25 pounds, while looking good overall. I used to feel my best around 165#s, at 5'10.5. After 9 months, I got hit with nasty flu, lost 18 pounds in 10 days, and was practically immaciated. At 138 pounds, I looked and felt unhealthy. My doc wanted me to gain weight, but I was so depressed, I didn't want to go back to the gym. After several months of force feeding myself, I did gain my weight back.. in fat. Since my metabolism had gone to shit, I had a terrible time... my weight kept climbing, and a climbing, till I hit 186 and 27% body fat (though I didn't know that till I finally joined the gym again in February.) I have a condition which breaks down muscle tissue and prevents protien synthesis, so for me, I'm taking this as a challenge. It's about health, first and foremost. But, I also want to look and feel good again. I'm actually fairly happy with the 185# number. I could even weight a bit more.. but what's important to me isn't weight, it's having muscle mass. I also want to hit the sub 10% range for the first time in my life. I'll be pretty happy then, but don't think I'll ever let depression or anything else ever get in the way of my goals ever again!
Oh, and for the record, since February, I'm down from 27%BF to 17.4%. YAWP!